The lead character - to be introduced in a 'backdoor pilot' airing as the 20th episode of Supernatural's ninth season - will be Ennis Roth, an aspiring cop whose life is changed forever following an encounter with Sam (Jared Padalecki) and Dean (Jensen Ackles).

Other regulars will include shape-shifting siblings David and Margo Hayden and veteran cop Freddie Costa.

Tribes will also feature the powerful Durant clan, including the show's chief villain Julian and his werewolf sister Violet, who holds a forbidden flame for David.

Supernatural continues on Tuesdays at 9/8c on The CW - the backdoor pilot episode is scheduled to air later this year.